digression
noun
                                                                                                                            
                                                            di·gres·sion
                    
                                                                                                              
                                                                                                                                  dī-ˈgre-shən  
                                                                                                                              
            də-
                                                      
                                                          1
                    
                                          
              
          
                                                      : the act or an instance of leaving the main subject in an extended written or verbal expression of thought : the act or an instance of digressing in a discourse or other usually organized literary work                                      
              
                             
Every place Hamilton, his parents, or his wife visited over a century's time is described at length; everyone he met merits at least a minor biographical digression.— Willard Sterne Randall
Willard Sterne Randall
                         
                
                    2
                    
                                archaic 
                                  
              
          
                                                      : a going aside                                      
                
                    
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  Merriam-Webster unabridged




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